[lwip-devel] [bug #27390] Source IP check in ip_input() causes it to drop valid DHCP packets

[Mandeep Sandhu]

Follow-up Comment #2, bug #27390 (project lwip):

The part that resets check_ip_src does so only if we haven't found a suitable
interface. This would happen when we're running as a DHCP client and haven't
configured the interface yet. But, in my case I was running a DHCP _server_
and already had the interface configured. So, the netif on which the packet
was received is selected. This causes the reset (of check_ip_src)  part to be
skipped. I think we should do a check for DHCP server port (68) as well.
Something like:

if(netif == NULL) {
   // Check for DHCP client port
} else {
   // Check for DHCP server port
}

What say?

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